Bump to v4.13.0.

findIndex.js

@@ -1,5 +1,9 @@
 var baseFindIndex = require('./_baseFindIndex'),
-    baseIteratee = require('./_baseIteratee');
+    baseIteratee = require('./_baseIteratee'),
+    toInteger = require('./toInteger');
+
+/* Built-in method references for those with the same name as other `lodash` methods. */
+var nativeMax = Math.max;
 
 /**
  * This method is like `_.find` except that it returns the index of the first
@@ -12,6 +16,7 @@ var baseFindIndex = require('./_baseFindIndex'),
  * @param {Array} array The array to search.
  * @param {Array|Function|Object|string} [predicate=_.identity]
  *  The function invoked per iteration.
+ * @param {number} [fromIndex=0] The index to search from.
  * @returns {number} Returns the index of the found element, else `-1`.
  * @example
  *
@@ -36,10 +41,16 @@ var baseFindIndex = require('./_baseFindIndex'),
  * _.findIndex(users, 'active');
  * // => 2
  */
-function findIndex(array, predicate) {
-  return (array && array.length)
-    ? baseFindIndex(array, baseIteratee(predicate, 3))
-    : -1;
+function findIndex(array, predicate, fromIndex) {
+  var length = array ? array.length : 0;
+  if (!length) {
+    return -1;
+  }
+  var index = fromIndex == null ? 0 : toInteger(fromIndex);
+  if (index < 0) {
+    index = nativeMax(length + index, 0);
+  }
+  return baseFindIndex(array, baseIteratee(predicate, 3), index);
 }
 
 module.exports = findIndex;